iphone - Moving an object randomly around the screen -

i'm trying animate uibutton move randomly around screen in different directions. code below kind of working. button begin moving along random path, however, continues move , forth between point , point b.

[uiview beginanimations:nil context:nil];  [uiview setanimationduration:1];  [uiview setanimationrepeatcount:1000];  [uiview setanimationrepeatautoreverses:yes];   cgfloat x = (cgfloat) (arc4random() % (int) self.view.bounds.size.width);  cgfloat y = (cgfloat) (arc4random() % (int) self.view.bounds.size.height);   cgpoint squarepostion = cgpointmake(x, y);  button.center = squarepostion;   [uiview commitanimations]; 

how can keep moving new random point every time changes directions, instead of moving , forth?

thanks!

try this:

    -(void)animationloop:(nsstring *)animationid finished:(nsnumber *)finished context:(void *)context {           [uiview beginanimations:nil context:nil];          [uiview setanimationduration:1];  // remove:       //  [uiview setanimationrepeatcount:1000];        //  [uiview setanimationrepeatautoreverses:yes];           cgfloat x = (cgfloat) (arc4random() % (int) self.view.bounds.size.width);          cgfloat y = (cgfloat) (arc4random() % (int) self.view.bounds.size.height);           cgpoint squarepostion = cgpointmake(x, y);          button.center = squarepostion;  // add:      [uiview setanimationdelegate:self]; // suggested @carl veazey in comment         [uiview setanimationdidstopselector:@selector(animationloop:finished:context:)];          [uiview commitanimations];     } 

and add counter (int) inside method check if it's executed more 1000 times, if wanna stop it...